deputy-tinyos is no longer a required package

deputy-tinyos is no longer a required package

deputy-tinyos does not build as is on Ubuntu Trusty, because OCaml needs
an update that then breaks the tinyos patches for deputy support.  For
now, solve this problem by removing deputy-tinyos from Depends.
Document that it is still relevant by adding it to Recommends, even
though at this time there is no way to install this package.